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  • 1
    Electronic Resource
    Electronic Resource
    Generation of high repetition rate far-infrared laser pulses (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 3383-3385 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the generation of pulsed optically pumped far-infrared (FIR) radiation with a repetition rate of 200 kHz. These pulses were obtained in a straightforward method by pumping a FIR resonator with a high repetition rate, rf-excited, waveguide CO2 laser. Pulses approximately 50 ns wide were generated both at 432.6 μm in HCOOH, and 117.7 μm in CH2F2. The pulse width of the FIR radiation was studied as a function of the CO2 pulse width, and the relative delay between the two was measured. Based on this data we conclude that the FIR radiation was gain switched and of a duration which was a function of either the gain bandwidth of the FIR transition, or more likely the FIR cavity parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.111282
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of pressure on Cd1−xZnxTe alloys (0≤x〈0.5) (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 2492-2494 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Electrical resistance measurements have been performed on samples of Cd1−xZnxTe (0≤x〈0.50) as a function of pressure up to 7.0 GPa. Based on a multidecade decrease in the resistance, the transition pressure of the B3 to B1 phase change is observed to increase from 3.3 to 6.7 GPa as x increases from 0 to 0.49. An anomalous drop in the resistance is observed to precede this transition; the magnitude of this drop increases with increasing x up to x=0.45, where it takes the form of a local minimum in the resistivity. The origin of this anomaly is not understood, but it is presumed to be similar to the local resistance minimum previously reported in ZnTe.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.337922
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  • 3
    Electronic Resource
    Electronic Resource
    Staggered hollow-bore CO2 waveguide laser array (1987)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 51 (1987), S. 1057-1059 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A modified hollow-bore ridge waveguide, utilizing a staggered ridge geometry, has been used successfully to obtain single-frequency operation from an array of CO2 waveguide lasers. The gain volume of the array is equivalent to six waveguide lasers of 37 cm length and 2.25×2.25 mm2 cross section. The output power from the sealed-off device reached 68 W cw. Stable single-frequency operation in the antisymmetric supermode was observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.98790
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  • 4
    Electronic Resource
    Electronic Resource
    Nonlinear magnetization processes in twinned Terfenol-D crystals (abstract) : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 5712-5712 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetostriction of the giant magnetostrictive cubic compound Terfenol-D (Tb0.3Dy0.7Fe1.9) changes discontinuously with applied magnetic field.1 Models of the magnetization processes in this material has shown that the sharp changes in magnetostriction arise from nonlinear domain magnetization reorientations.2 Measurements of the transverse magnetization in twinned crystals of Terfenol-D as a function of applied field and crystal orientation are presented from which magnetic domain populations involved in the magnetization processes are deduced. Barkhausen noise spectra provides information complementary to that obtained through magnetization measurements and as such is used to elucidate the discontinuous nature of the domain processes that lead to the sharp changes in magnetostriction in this material. The transverse ac susceptibility measurements have been obtained from bar-shaped specimens, with principle axis parallel to the growth axis 〈112〉 and have been augmented with rotating sample and torque magnetometry on {011} and {112} plane disk samples, from which Barkhausen spectra has been obtained in conjunction with anisotropy measurements. The data indicate that domain wall motion is operative even in fields approaching saturation and that intrinsic stress and wall pinning mechanisms have a significant effect on the achievable magnetoelastic strain. The critical fields associated with domain population changes have been theoretically deduced and are in excellent agreement with susceptibility and Barkhausen data. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364645
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